Then create your kernel port groups that you want to use for iscsi, my commands looked like this… (repeat for each iscsi kernel port you have) — note : DO NOT ADD ANY VMKERNEL(s) from the GUI, instead use the steps below

esxcfg-vswitch -A iSCSI vSwitch0

If you are using a tagged vlan you will also need to add the vlan tag to the above port group

esxcfg-vswitch -v 192 -p iSCSI vSwitch0

esxcfg-vmknic -a iSCSI -i 10.0.0.101 -n 255.255.0.0 -m 9000

To confirm you have set the MTU (frame size) correctely, run the following….

esxcfg-vmknic -l

you should see your iSCSI kernel ports with a MTU of 9000 all going well. Confirm connectivity using